Method of producing piston rings



Oct. 12 ,1926.

I W. R. REESE METHOD OF PRODUCING PISTON RIN"GS ile Sept. 12. 1924 2 Sheets- Sheet '1 HM- W!!! W/TNE88ES I INVENTOR 75?; a%% R WES/012E fieese -4% Mfg A TTORNEYS W. R. REESE METHOD OF PRODUCING PISTON RINGS Filed Sept. 12, 1924 2 Sheets-Shet 2 N Q N WITNESSES MENTOR Y ATTORNEYS Patented oct. 12. 1926.

* UNITE) s WESTON ROGER REESE, or scRAN'roN, PENNSYLVANIA.

METHOD OF rnonuerivs rrs'roN RINGsf- 1 ab ncauon'fiiea September 12, isa if'seriai No. 737345.

I My invention relates to a method and means forsubjecting the inner wall or inner circumference of a piston ringto pressure in varying degrees according to the eccen tricity of the ring.

The general object of the invention is to ,provide for effecting the equal tensioning 15 in split ormi:

of the ring so that when placed in a cylinder bore the ring will expand with equal pressure against the cylinder wall at all points of the circumference. n

Specifically, the-invent'onhasfor its purpose to effect the tensioning of the ring by the rolling pressure of a roller die'whereby' to avoid subjecting the-ring to blows that would tend to cause fracture of the ring either in themanufacture of the ring or subsequently to the emplacing of the ring on the piston" or while ring is in use.

The nature of my lnvention and its 1dis tinguishing features and advantages will clearly appear as the description proceeds.

Reference is to be 'had'to the accompanying drawings forming a part of thisspe'cification; itbeing understood that the drawings are merely illustrative of one example of the invention. V I

Fig. 1 is a front elevation of the machine for carrying out my invention;

Fig; 2 is a transverse vertical'section in the plane indicated by the line 22, Fig. 1;

Fig. 3 is a plan viewof the machine; and,

Figs. 4, 5, 6, 7 8, and 9 represent the ring in different steps of manufacture. In carrying out my invention in practice with the aid of the machine illustrated, said machine is'formed as follows: base 1O is provided on which is a strap 11, said base at the 13. The base and strap as thus arranged provide for holding a chuck. 14 in which the piston ring a is held. ThebaselO is formed with an'annular broad rib 110 and the chuck 14 is formed with spaced annularbeads 114, c said beads accommodating between them the rihllOand the strapll to retain the chuck against displacement. p For holding the ring'a in the chuck 14,

said chuck is provided with an auxiliary chuck15-therein, said main and said auxiliary chucks being in ring form and the auxiliary chuck being suitably fastened in the main chuck as by screws16.

The ring a is laced into the statuary front thereof and saidqstrap at its" ends having cars 12 toreceivebolts or screws facture. 'rough and'in the form of a flat ring of unbroken continuity with the inner and peripheries concentric, to each other Fig,

an annular gear 17 which in practiceinay ring gear 17 is a pinion 18 anda shaft 19,

said shaft 'havingbearings' in thevbase 10 and equipped with a suitable clutch 20 including 'ashiftable clutch element 21 controlled by a clujtch lever22. Loose on the shaft 19 is shown a drive pulley-23 rigid with which is one of the elements of the clutch 20. WVhen The holding action of the base 10 and strap 11 on the chuck 14 permits said chuck to be turned so as to turn the ring ct. In the machine illustrated for carrying out invention the mainjchuck 14 is provided with be shrunk in position or otherwise made rlgld' with said chuck; Meshing with the the pulley 28 is'dr'ivenand the elements of V the clutch are in'engagement, the shaft 19 will be turned and with it the pinion 18 for turning the chuck 14L A rollerdie'24 isprovided within the auxviliar}'("chuck15and in the plane of the'seat provided in said auxiliary chuck for the ring "so that said die will beeffective in subjecting said ring to rolling pressure The roller die 24 is on a transverse shaft 25 supported Thus, theblock sections 26 and'12 6 maybe iraisedto dispose the roller die 24 in a posi- "tion to accord with the diameter of the given a piston ring a. Transverse bolts or screws 28 bindthe block'sections 26'and 126 on the guides 27. A bronze bushing 29 is fitted in the block sections 26, 126 and affordsa bear- 'ing in which the shaft 25 may'turn in response to the turning of the roll-er by its frictional engagement with the internal wall of the piston ring. a as the latter revolves with chucks 14, 15. A coil spring 30 on the shaft 25 abuts'at one end against a head 31 on the shaft 25 at the rear end of the latter and abuts against an annular flange 32 on the bushing 29 a In Figs. 4 to 9 I have illustrated the form of the ring a in the dilferentsteps of manu- Fig. 4 shows the ring blank in the outer,

5shows the same-blank as in Fig. 4 except that the ring hasbeen machined inside and out and given the form of the split ring by the usual method. After the blank has been split as in Fig. 5 it is mac inner periphery is hinedsothat the .inqa block formed of sections 26 and 126 I which are'overtically disposed and are adapt ed to-be adjusted verticallygon guides 27.

lid

tine withthe outer to I periphery; as'is shown in Fig. 6." The ring in the, form shown 1n Fig. 6 1s then placed into the chuck 15 of the machine. Roller die 2-1 is now adjustedb'y shifting the block" sect-ions 26 and 126 vertically on the guides 27 until said roller die has close contact with the inner eccentric- Walloi the-ring:

a and the guides 26 and 126 are locked in this position. The result is that .Wi.tlrtl1e rotation of the chuckleandring'e, said ring will be subjected to enrolling pressure by the roller die-:24, said die expandingthe ring by varying; degrees according-to the eccentric shape ofzthe ring, and 'the'pressure WllllQilCll its maximum; in the; region of the ring diametrically, opposite the split of the ringtor tliegrinp; shown in Fig. 6.

Thus the-piston}ring-willbe properly tensioned- Ajfter the ringha's beenthus s ub ected internally-to the pressure ofthe roller 7 die 24-; the outer:peripherygofsaid ringis turned dotyn externallyin a lathe to bring it coneentrlc w th the-inner periphery,-the

operation being "done hile the -ring is held compressed as shown in;Figure v The IlIlgflWhQH turned and released yill 'thentake the form shown in Figure 9.

o1 the. ring.

from the spirit ot theinvention as defined in the appended claims.

Having. thus described my invention, I claim':'

1.-In-= a method of producing a piston ring, the steps" of machining a split ring so that 1 the innerand =outer peripheries have an eccentric relation subjecting the ring in- ;ternally to roller pressure; to tension the ring, then turning down the-outer periphery concentric With the inner periphery.

2; In a methodof: producing a piston ring, machining the ring so that the inner and outer peripheries; are in eccentric relation, subjecting the ringqt o rolling pressure-to tensio'nflthe ring andVtu-rning down the ring externally concentric With theinner periphery 3. In a-methodof making a piston ring,

producing; a ring of unbroken continuity, splitting; said ring, machining said split r51 so that the inner and outer peripheries have an eccentric relation, subjecting the ring at tieeccentric inner periphery to rolling pressure to'tensionthe ring, and turning down the ring externally concentric with the inner periphery.

l. In-a piston ring, a method of producing: tensior iing in said. ring by graduated rolling pressure, the graduations'of'pressure being controlledby the eccentric shape of V the i ring:

5.",In a pistonring; a .method of producing tensioning in said ring by graduated internal rolling pressure upon the interior periphery'thereof, the graduationsiof pressure being controlledb'y the eccentricshape es oN Roe-ER REESE. 

